Dr. Schunck on Ruhian and its Products of Decomposition, 209 



II. 0-4030 grra. of another preparation, obtained by the 

 action of bicarbonate of baryta, gave 0*8240 carbonic acid and 

 0-2020 water. 



III. 0-2750 grm., formed by the action of caustic soda on 

 rubian, gave 0*5605 carbonic acid and 0*1390 water. 



IV. 0*4750 grm., obtained by means of ammonia, gave 0*9670 

 carbonic acid and 0*2295 water. 



V. 0*2920 grm., obtained by means of caustic lime, gave 

 0*6000 carbonic acid and 0*1490 water. 



These analyses give in 100 parts — 



I. II. III. IV. V. 



Carbon . . 55*93 55*76 55*58 55-52 56*04 

 Hydrogen . 5*42 5*56 5*61 5*36 5*66 

 Oxygen . . 38*65 38*68 38*81 39*12 38*30 

 corresponding to the formula C^^ H'^ 0% as the following cal- 

 culation shows : — 



Eqs. Calculated. 



Carbon ... 52 312 56*01 



Hydrogen . . 29 29 5*20 



Oxygen ... 27 ^16 38-79 



557 100*00 



Rubianate of potash was prepared by dissolving the acid in as 

 small a quantity of water as possible, adding an excess of carbo- 

 nate of potash, allowing the salt to crystallize, collecting it on a 

 filter, washing it with just sufficient water to remove the excess 

 of alkali, and drying. On analysing it I obtained the following 

 results : — 



I. 0*3580 grm., dried in the water-bath and burnt with chro- 

 mate of lead, gave 0*6830 carbonic acid and 0*1590 water. 



0*5590 grm. gave 0*0780 sulphate of potash. 



II. 0*4850 grm. of another preparation, dried in vacuo y gave 

 0*9250 carbonic acid and 0*2070 water. 



8140 grm. gave 0*1150 sulphate of potash. 

 These numbers lead to the following composition : — 



Carbon . 

 Hydrogen 

 Oxygen . 

 Potash . 



595*2 10000 100*00 100*00 



The soda salt, prepared in the same way as the potash salt, 



was also analysed, but the analysis led to no satisfactory results. 



A compound with baryta was obtained by dissolving the acid 



in water and adding ammonia and chloride of barium. The 



precipitate, which was bulky and of a fine crimson colour, was 



Phil Mag. S. 4. Vol. 12. No. 78. Sept, 1856. P 



